A group of friends on a trip find themselves in a dire situation after encountering an alien, Kronark. Kronark, from the dying planet Thera, reveals his mission to find "Byro," a life-sustaining crystal on Earth, explaining that he has taken control of the local villagers to aid his search. After understanding the alien's motives and the extent of his control, the friends devise and execute a plan to confront him, culminating in a chaotic battle where they ultimately defeat Kronark. The episode concludes with the group contemplating the aftermath of their ordeal and the lingering effects of their encounter.